#include <stdio.h>
#include <math.h>
int main()
{
    float x1,x2,y1,y2,distance;

    printf("Input(x1,y1):\n");

    scanf("%f%f",&x1,&y1);

    printf("Input(x2,y2):\n");

    scanf("%f%f",&x2,&y2);

    distance=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));

    printf("distance=%.2f\n",distance);







    return 0;
}
